I was thinking of buying something like this to make the antminer wireless
http://www.amazon.de/Wireless-Bridge-802-11b-Router-Kamera/dp/B006JV2H6O/ref=sr_1_1?ie=UTF8&qid=1422141425&sr=8-1&keywords=USB+Wireless+Network+Adapter+RJ45+Ethernet+Dongle
My question is: does anyone know any reason why this could not work? so I dont waste time and money with it.

Yep, it should work (but it doesn't make S5 truely wireless...). You will need a kind of this cable to power up this bridge: http://www.amazon.com/Coolerguys-Molex-Dual-Power-Connecter/dp/B006JCHN08/ref=sr_1_9?ie=UTF8&qid=1422183878&sr=8-9&keywords=molex+to+usb+power

But I don't know how to configure this bridge (you should somehow point it to correct wifi network). Huh

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Moving onto the cooling I was thinking about replacing the noisy fan with a push-pull composed of 2x noctua NF-F12 PCC industrial 3000 rpm PWM fans:
http://www.noctua.at/main.php?show=productview&products_id=78&lng=en&set=1

Nice thing if you have enough money. ) There are another fans available for purchasing which are cheaper.

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And to finish I have narrowed my PSU choices to this, but it would be great if somebody could tell me fromhis/her experience which one works

I chose my PSU Chieftec APS-850CB (http://www.amazon.de/s/ref=nb_sb_noss/277-1588353-6713536?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&url=search-alias%3Daps&field-keywords=Chieftec+APS-850CB) because it has 4 separate 6+2 pin PCI-E cables to power ip my S5. Just to be on the safe side. But you can choose both CS750M or RM750 though. Personally I would like RM750. )